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X is the number of distinct positive divisors of X. What is

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Director
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X is the number of distinct positive divisors of X. What is [#permalink] New post 07 Nov 2005, 15:25
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$X is the number of distinct positive divisors of X. What is the value of $$90?

6
7
8
9
10

Sorry made an edit ($$90 not $$X)
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"Wow! Brazil is big." —George W. Bush, after being shown a map of Brazil by Brazilian president Luiz Inacio Lula da Silva, Brasilia, Brazil, Nov. 6, 2005

http://www.nytimes.com/2005/11/21/inter ... prexy.html


Last edited by Titleist on 07 Nov 2005, 17:43, edited 1 time in total.
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 [#permalink] New post 07 Nov 2005, 17:39
aikido_fudoshin wrote:
I'll pick 8. 2x2x2?


Can you explain how did you solve it? To me this problem looks strange, unless its missing something.
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 [#permalink] New post 07 Nov 2005, 17:44
duttsit wrote:
aikido_fudoshin wrote:
I'll pick 8. 2x2x2?


Can you explain how did you solve it? To me this problem looks strange, unless its missing something.


astute as usual my friend - plz see correction. my apologies.
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"Wow! Brazil is big." —George W. Bush, after being shown a map of Brazil by Brazilian president Luiz Inacio Lula da Silva, Brasilia, Brazil, Nov. 6, 2005

http://www.nytimes.com/2005/11/21/inter ... prexy.html

Director
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 [#permalink] New post 07 Nov 2005, 17:47
Titleist wrote:
astute as usual my friend - plz see correction. my apologies.


Hey, Howdy? I just :peek sometime back. You were taking a test. How did you do?
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 [#permalink] New post 07 Nov 2005, 17:56
assumption:
$$90 = $ ($90)
$90 = 12
$12 = 6

ans: A

yeah..what test did you beat? :)
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 [#permalink] New post 07 Nov 2005, 17:57
gsr wrote:
Titleist wrote:
astute as usual my friend - plz see correction. my apologies.


Hey, Howdy? I just :peek sometime back. You were taking a test. How did you do?


I haven't taken it yet. :P I decided to just work on problems I got wrong and problems I got right for the wrong reasons. You guys (Duttsit and CompanY) should really buy access to the challenge archives (not to sound like an advertisement) - they are great! The problems are pretty tough.

Having said that, I completed challenge 7 from the archives on Saturday morning. I got blown away - 70th percentile (compared to the folks that took it during the challenge). :P So I'm going through the damage now.


Unfortunately, I can't post any of the challenges, I just read the sticky asking that people not post challenge materials. I apologize for having had posted some in the past.
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"Wow! Brazil is big." —George W. Bush, after being shown a map of Brazil by Brazilian president Luiz Inacio Lula da Silva, Brasilia, Brazil, Nov. 6, 2005

http://www.nytimes.com/2005/11/21/inter ... prexy.html

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 [#permalink] New post 07 Nov 2005, 17:57
duttsit wrote:
yeah..what test did you beat? :)


Hey duttsit, when are you beating the real test? With your skills, you don't need to wait for so long!
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 [#permalink] New post 07 Nov 2005, 18:07
gsr wrote:
duttsit wrote:
yeah..what test did you beat? :)


Hey duttsit, when are you beating the real test? With your skills, you don't need to wait for so long!


qsr, thanks for inspiratiom, but Kaplan test i took recently tell otherwise. I got slaughtered (in Titleist term). I need to avoid silly mistakes (reading b/a as a/b, missing positive integer as integer etc etc).

Titleist, i never did any challenge. Do you think they are worth practice from the GMAT viewpoint. I heard they are much tougher than what we see in real test even when you scoring high.
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 [#permalink] New post 07 Nov 2005, 18:33
duttsit wrote:
gsr wrote:
duttsit wrote:
yeah..what test did you beat? :)


Hey duttsit, when are you beating the real test? With your skills, you don't need to wait for so long!


qsr, thanks for inspiratiom, but Kaplan test i took recently tell otherwise. I got slaughtered (in Titleist term). I need to avoid silly mistakes (reading b/a as a/b, missing positive integer as integer etc etc).

Titleist, i never did any challenge. Do you think they are worth practice from the GMAT viewpoint. I heard they are much tougher than what we see in real test even when you scoring high.



I definitely think the challenges are worth it. SOme questions are very difficult while other questions I think are quite reasonable. Although Duttsit, I think you'd probably get close to a perfect score on quant section of the real exam. You are probably just better off working on verbal.
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"Wow! Brazil is big." —George W. Bush, after being shown a map of Brazil by Brazilian president Luiz Inacio Lula da Silva, Brasilia, Brazil, Nov. 6, 2005

http://www.nytimes.com/2005/11/21/inter ... prexy.html

Director
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 [#permalink] New post 07 Nov 2005, 18:38
Titleist wrote:
I definitely think the challenges are worth it. SOme questions are very difficult while other questions I think are quite reasonable. Although Duttsit, I think you'd probably get close to a perfect score on quant section of the real exam. You are probably just better off working on verbal.


I agree that he doesn't need anymore practice on Quant. But, if he goes off to Verbal, who will post the right answers to your questions? :wink:
Some of them, I wouldn't even go near :shock: :lol: :twisted:
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 [#permalink] New post 07 Nov 2005, 18:41
gsr wrote:
Titleist wrote:
I definitely think the challenges are worth it. SOme questions are very difficult while other questions I think are quite reasonable. Although Duttsit, I think you'd probably get close to a perfect score on quant section of the real exam. You are probably just better off working on verbal.


I agree that he doesn't need anymore practice on Quant. But, if he goes off to Verbal, who will post the right answers to your questions? :wink:
Some of them, I wouldn't even go near :shock: :lol: :twisted:



Oh no! In no way am I telling him to leave the math section. I need this guy! :P


GSR - you can hold your own!
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"Wow! Brazil is big." —George W. Bush, after being shown a map of Brazil by Brazilian president Luiz Inacio Lula da Silva, Brasilia, Brazil, Nov. 6, 2005

http://www.nytimes.com/2005/11/21/inter ... prexy.html

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 [#permalink] New post 08 Nov 2005, 13:57
hey..duttsit, email/pm paret...maybe he can hook you with challenges...you have been a good contribuitor to the forum, so he'll make an exception for you...

I also think we should do the chllanges..they are important...
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 [#permalink] New post 08 Nov 2005, 14:00
is there a shortcut to find how many factors a number has given that we can find out the primes?

duttsit wrote:
assumption:
$$90 = $ ($90)
$90 = 12
$12 = 6

ans: A

yeah..what test did you beat? :)
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 [#permalink] New post 08 Nov 2005, 15:30
fresinha12 wrote:
is there a shortcut to find how many factors a number has given that we can find out the primes?

duttsit wrote:
assumption:
$$90 = $ ($90)
$90 = 12
$12 = 6

ans: A

yeah..what test did you beat? :)


yes. write number into prime number factorization form. if:
x = a^u * b^v * c^z

the total number of factors: (u+1) * (v+1) * (z+1)

for example:
90 = 3^2 * 2 * 5
total number of factors: (2+1) * (1+1) * (1+1) = 12
  [#permalink] 08 Nov 2005, 15:30
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